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Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
OPERATING INCOME |  |  |  |  |  |  |  |  |  |  |
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | $ 7,908 | $ 4,265 | $ 4,391
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | 32,857 | 33,972 | 36,407
Allocated income tax benefit/(expense) |  |  |  |  |  |  |  |  | (37,263) | (35,040) | (27,284)
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,636) | (1,717) | (1,676)
Net income | $ 18,620 | $ 17,982 | $ 17,493 | $ 16,579 | $ 15,728 | $ 15,630 | $ 18,553 | $ 16,259 | 70,674 | 66,170 | 63,887
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 28,175 | 26,043 | 24,851
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | 160 | 66 | 62
Other |  |  |  |  |  |  |  |  | 3 | 2 | 14
Total operating income |  |  |  |  |  |  |  |  | 28,338 | 26,111 | 24,927
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 2,096 | 1,998 | 1,965
Other |  |  |  |  |  |  |  |  | 583 | 628 | 667
Total operating expense |  |  |  |  |  |  |  |  | 2,679 | 2,626 | 2,632
Income before taxes |  |  |  |  |  |  |  |  | 25,659 | 23,485 | 22,295
Allocated income tax benefit/(expense) |  |  |  |  |  |  |  |  | 1,244 | (796) | 472
Income before equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 26,903 | 22,689 | 22,767
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 44,172 | 44,653 | 42,196
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (401) | (1,172) | (1,076)
Net income |  |  |  |  |  |  |  |  | $ 70,674 | $ 66,170 | $ 63,887

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